Move /src/test to /tests

tests/ui/trailing-comma.rs

@@ -0,0 +1,35 @@
+// run-pass
+// pretty-expanded FIXME #23616
+
+fn f<T,>(_: T,) {}
+
+struct Foo<T,>(#[allow(unused_tuple_struct_fields)] T);
+
+struct Bar;
+
+impl Bar {
+    fn f(_: isize,) {}
+    fn g(self, _: isize,) {}
+    fn h(self,) {}
+}
+
+enum Baz {
+    Qux(#[allow(unused_tuple_struct_fields)] isize,),
+}
+
+#[allow(unused,)]
+pub fn main() {
+    f::<isize,>(0,);
+    let (_, _,) = (1, 1,);
+    let [_, _,] = [1, 1,];
+    let [_, _, .., _,] = [1, 1, 1, 1,];
+    let [_, _, _, ..,] = [1, 1, 1, 1,];
+
+    let x: Foo<isize,> = Foo::<isize,>(1);
+
+    Bar::f(0,);
+    Bar.g(0,);
+    Bar.h();
+
+    let x = Baz::Qux(1,);
+}